Intro to Tissues Notes 1

What are tissues?

Groups of cells that work together towards a common function

Histology

study of tissues

4 types of tissues in the body?

epithelial, connective, muscular, nervous

What is epithelial tissue?

tissue that covers and lines the surfaces and cavities and forms glands

functions of epithelial tissue

protection, control permeability (diffusion, absorption, filtration, excretion, secretion), sensory reception, produces special secretions

What are some main functions of connective tissue?

supports other tissues, binds organs together, transport, energy

What is the main function of muscle tissue?

create movement

What is the main function of nervous tissue?

communication and control

What characteristics do all epithelial tissue share?

closely packed cells, avascular, 3 surfaces, nerve supply, high capacity for renewal

avascular

without blood vessels

basement membrane

Layer between epithelium and underlying connective tissue

2 ways to name epithelial tissue

number of cell layers and cell shape (at top)

simple

one layer of cells attached to the basement membrane

Stratified

2 or more layers of cells

Squamous

Flat cells

Cuboidal

cube-shaped cells, as tall as they are wide

Columnar

column shaped, taller than wide

pseudo

false, deceptive, fake

transitional tissue

cells at top change shape when tissue stretches

endocrine glands

Glands that release hormones into the bloodstream

exocrine glands

Glands that secrete chemicals out through a duct and onto a surface (sweat, saliva)